Below are a set of numbers. They are PRIME numbers, except for 1.

1, 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41

The missing numbers are called COMPOSITE numbers. Using ONLY prime numbers and 1 can you get the missing composite numbers by adding, subtracting, multiplying or dividing. In each sum you can only use a number once

1 + 3 = 4
2 x 3 = 6
(3 + 1) x 5 = 20

Can you also get all the prime numbers using a sum with different primes?

3 - 1 = 2
2 + 3 = 5

When creating your sums try to use as few numbers as possible. So for 20

(3+1) x 5 rather than [(5+7) - 2] x [3-1]

ie.,